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Spinal Nerve Compositions of the Terminal Branches of the Lumbosacral Plexus

우정수 1,  Hur, Mi-Sun ORD ID 2,  김호정 2,  이규석 2

1관동대학교
2관동대학교

Accredited

ABSTRACT

The purpose of this study was to classify the spinal nerve compositions of the terminal branches of the lumbosacral plexus, providing data of their participating quantities. Twenty-five sides of the lumbosacral plexus extracted from Korean adult cadavers were used in this study. The iliohypogastric nerve was mostly arisen from L1 (88.2%, thickness L1 0.7 mm). The ilioinguinal nerve was arisen from only L1 (100%, thickness L1 0.6 mm). The genitofemoral nerve was commonly arisen from L1 and L2 (62.5%, thickness L1 0.6 mm, L2 0.7 mm). The lateral femoral cutaneous nerve was classified into 4 types, and the most common type was that L2 and L3 composed this nerve (56.0%, thickness L2 0.8 mm, L3 0.4 mm). The femoral nerve was classified into 2 types, and it was usually composed of L2, L3 and L4 (88.0%, thickness L2 1.4mm, L3 2.7 mm, L4 2.3 mm). The obturator nerve was arisen from L2, L3 and L4 in all cases (100%, thickness L2 0.5 mm, L3 1.3 mm, L4 1.1 mm). The common fibular component of sciatic nerve was mostly arisen from L4,L5, S1 and S2 (84.0%, thickness L4 0.9 mm, L5 2.0 mm, S1 2.1 mm, S2 1.2 mm). The tibial component of sciatic nerve was mainly arisen from L4, L5, S1 and S2 (96.0%, thickness L4 0.9 mm, L5 1.9 mm, S1 2.2 mm, S2 1.9 mm). The superior gluteal nerve was commonly derived from L4, L5 and S1 (56.0%, thickness L4 0.7 mm, L5 1.1 mm,S1 0.9 mm). The inferior gluteal nerve was comprised of L5, S1 and S2 in several cases (54.2%, thickness L5 0.9mm, S1 1.3 mm, S2 0.8 mm). The posterior femoral cutaneous nerve was composed of S1 and S2 in higher freqeuncy (40.0%, thickness S1 0.9 mm, S2 1.0 mm, S3 0.8 mm). The perforating cutaneous nerve was arisen from S2and S3 in higher frequency (56.0%, thickness S1 0.7 mm, S2 0.9 mm, S3 1.1 mm). The pudendal nerve was derived from S3 in many cases (52.9%, thickness S3 1.5 mm). These anatomical results may be helpful to predict the spinal nerve root lesions of the lumbosacral plexus.

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* References for papers published after 2023 are currently being built.

This paper was written with support from the National Research Foundation of Korea.
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